X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=doc%2FuImage.FIT%2Fsignature.txt;h=b2f89fcc65d0fd2a14693b26ce7f93ce0fe3412d;hb=8c8dc4c61518124eb35f4dd9d8466378ba247e9c;hp=95020377055d259a2b9e285b178371fccefc3ea3;hpb=9f5f51540d0d6af03ff22f55b7afc3fda6a4120d;p=u-boot

diff --git a/doc/uImage.FIT/signature.txt b/doc/uImage.FIT/signature.txt
index 9502037705..b2f89fcc65 100644
--- a/doc/uImage.FIT/signature.txt
+++ b/doc/uImage.FIT/signature.txt
@@ -66,7 +66,8 @@ Creating an RSA key and certificate
 -----------------------------------
 To create a new public key, size 2048 bits:
 
-$ openssl genrsa -F4 -out keys/dev.key 2048
+$ openssl genpkey -algorithm RSA -out keys/dev.key \
+    -pkeyopt rsa_keygen_bits:2048 -pkeyopt rsa_keygen_pubexp:65537
 
 To create a certificate for this:
 
@@ -159,6 +160,7 @@ For RSA the following are mandatory:
 
 - rsa,num-bits: Number of key bits (e.g. 2048)
 - rsa,modulus: Modulus (N) as a big-endian multi-word integer
+- rsa,exponent: Public exponent (E) as a 64 bit unsigned integer
 - rsa,r-squared: (2^num-bits)^2 as a big-endian multi-word integer
 - rsa,n0-inverse: -1 / modulus[0] mod 2^32
 
@@ -328,6 +330,9 @@ be enabled:
 CONFIG_FIT_SIGNATURE - enable signing and verfication in FITs
 CONFIG_RSA - enable RSA algorithm for signing
 
+WARNING: When relying on signed FIT images with required signature check
+the legacy image format is default disabled by not defining
+CONFIG_IMAGE_FORMAT_LEGACY
 
 Testing
 -------
@@ -358,6 +363,7 @@ Test Verified Boot Run: unsigned config: OK
 Sign images
 Test Verified Boot Run: signed config: OK
 check signed config on the host
+Signature check OK
 OK
 Test Verified Boot Run: signed config: OK
 Test Verified Boot Run: signed config with bad hash: OK
@@ -371,12 +377,14 @@ Test Verified Boot Run: unsigned config: OK
 Sign images
 Test Verified Boot Run: signed config: OK
 check signed config on the host
+Signature check OK
 OK
 Test Verified Boot Run: signed config: OK
 Test Verified Boot Run: signed config with bad hash: OK
 
 Test passed
 
+
 Future Work
 -----------
 - Roll-back protection using a TPM is done using the tpm command. This can